FKIE_CVE-2021-3987

Vulnerability from fkie_nvd - Published: 2024-11-15 11:15 - Updated: 2026-06-17 04:06
Severity
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Summary
An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the `create_shelf` method in `shelf.py` not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users.
References
security@huntr.devhttps://github.com/janeczku/calibre-web/commit/bcdc97641447965af486964537f3821f47b28874Patch
security@huntr.devhttps://huntr.com/bounties/29fcc091-87b6-43bc-ab4b-3c0bec3f71dfExploit
Impacted products
Vendor Product Version
janeczku calibre-web *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "janeczku/calibre-web",
          "vendor": "janeczku",
          "versions": [
            {
              "lessThanOrEqual": "latest",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@huntr.dev"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:calibre-web_project:calibre-web:-:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "product": "calibre-web",
          "vendor": "calibre-web_project",
          "versions": [
            {
              "lessThan": "*",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:janeczku:calibre-web:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CB86DF8E-5F67-41CA-B657-D8E0A61CD22A",
              "versionEndExcluding": "0.6.15",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the `create_shelf` method in `shelf.py` not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users."
    },
    {
      "lang": "es",
      "value": "Existe una vulnerabilidad de control de acceso indebido en janeczku/calibre-web. La versi\u00f3n afectada permite a los usuarios sin permisos de estanter\u00eda p\u00fablica crear estanter\u00edas p\u00fablicas. La vulnerabilidad se debe a que el m\u00e9todo `create_shelf` en `shelf.py` no verifica si el usuario tiene los permisos necesarios para crear una estanter\u00eda p\u00fablica. Este problema puede provocar que los usuarios realicen acciones no autorizadas."
    }
  ],
  "id": "CVE-2021-3987",
  "lastModified": "2026-06-17T04:06:20.773",
  "metrics": {
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.0"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.5,
        "source": "security@huntr.dev",
        "type": "Secondary"
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-3987",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-11-15T18:27:02.281125Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-11-15T11:15:06.610",
  "references": [
    {
      "source": "security@huntr.dev",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/janeczku/calibre-web/commit/bcdc97641447965af486964537f3821f47b28874"
    },
    {
      "source": "security@huntr.dev",
      "tags": [
        "Exploit"
      ],
      "url": "https://huntr.com/bounties/29fcc091-87b6-43bc-ab4b-3c0bec3f71df"
    }
  ],
  "sourceIdentifier": "security@huntr.dev",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ],
      "source": "security@huntr.dev",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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